Katherine K. Davis (1892-1980) was a composer, pianist, and author of the famous Christmas tune "The Little Drummer Boy".

Katherine Kennicott Davies was born in St. Joseph, Missouri, on June 25, 1892, and composed her first piece of music, "Shadow March," at the age of 15. She graduated from St. Joseph High School in 1910, and studied music at Wellesley College in Massachusetts. After her graduation, she continued at Wellesley as an assistant in the Music Department, teaching music theory and piano. At the same time, she studied at the New England Conservatory of Music in Boston. Davis also studied with Nadia Boulanger in Paris.

She taught music at the Concord Academy in Concord, Massachusetts, and at the Shady Hill School for Girls in Philadelphia. Many of her over 600 compositions were written for the choirs at her school.

Her most famous composition, "The Little Drummer Boy" (originally titled "The Carol of the Drum"), which she wrote in 1941, became famous when it was recorded by the Trapp Family Singers. Another famous hymn by Katherine Davis is the Thanksgiving hymn "Let All Things Now Living" which uses the melody of the traditional Welsh folk song The Ash Grove.

She was a member of the American Society of Composers, Authors and Publishers (ASCAP) and was granted an honorary doctorate from Stetson University, in DeLand, Florida.

She left all of the royalties and proceeds from her compositions, which include operas, choruses, children's operettas, cantatas, piano and organ pieces, and songs, to Wellesley College's Music Department. These funds are used to support musical instrument instruction.

Katherine K. Davis continued writing music until she became ill in the winter of 1979-1980. She died on April 20, 1980, at the age of 88, in Littleton, Massachusetts.